Microsoft ExcelでVBAを使用してユーザー名を返す関数

Public Declare Function GetUserName Lib "advapi32.dll" _

Alias "GetUserNameA" (ByVal lpBuffer As String, nSize As Long) As Long

Function ReturnUserName() As String

' returns the NT Domain User Name

Dim rString As String * 255, sLen As Long, tString As String

tString = ""

On Error Resume Next

sLen = GetUserName(rString, 255)

sLen = InStr(1, rString, Chr(0))

If sLen > 0 Then

tString = Left(rString, sLen - 1)

Else

tString = rString

End If

On Error GoTo 0

ReturnUserName = UCase(Trim(tString))

End Function

ActiveUserName = Application.UserName